My Dad worked on these (mechanical designer designing
jigs and fixtures for=
assembly) at QYX in Lionville, PA in the late 70's
There claim to fame was that you could type a letter and then have another =
one type the same thing over the phone lines as an original document....all=
pre facsimile machine.
It is said that the technology was stolen to help create the fax machine.
Err, the analogue fax machine goes back (at least) to the Fultograph iu
the 1920s, and there were older ideas than that.
I still have my Muirhead Picture Trasnmitter, a portable battery/mains
traansmitter part of an analogue fax system, It would guess (based o nthe
valves in it) it's 1950s vintage.
-tony